Question

drag the text blocks below into their correct order.
mouth: the beginning of the gastrointestinal tract where chewing begins and where the swallowing phase is initiated.
esophagus: moves the bolus of food to the stomach by peristaltic waves.
stomach: stores, mixes, dissolves, and continues the digestion of food, particularly of proteins.
pharynx: serves as a passageway that is common to both air and ingested food.
pyloric sphincter: a ring of skeletal muscle that relaxes during swallowing to allow a bolus of food to continue forward in the gi tract.
upper esophageal sphincter: a ring of smooth muscle and connective tissue that helps to regulate how much chyme passes between the antrum and the duodenum.
lower esophageal sphincter: a ring of smooth muscle that relaxes to allow the bolus of food to enter the stomach and quickly closes to reseal the junction between the esophagus and the stomach.

Explanation:

The correct order of the gastrointestinal tract components is determined by the flow of food. The mouth is the starting point where chewing and swallowing initiation occur. Then the pharynx acts as a common passageway. After that, the esophagus moves the food bolus (by peristaltic waves). The lower esophageal sphincter controls entry into the stomach. The stomach stores, mixes, dissolves, and continues digestion. The pyloric sphincter (though the description in the problem has an error - it's smooth muscle, not skeletal) regulates passage from the stomach. The upper esophageal sphincter description in the problem is incorrect (it's related to the upper part of the esophagus, not the antrum - duodenum junction as stated wrongly here). But following the flow: Mouth → Pharynx → Esophagus → Lower esophageal sphincter → Stomach → Pyloric sphincter (ignoring the muscle type error in description) → (next would be small intestine etc., but from the given options).

Answer:

Mouth, Pharynx, Esophagus, Lower esophageal sphincter, Stomach, Pyloric sphincter.